Doepfer MBP25 Midi Bass Pedal Electronics Kit - Manual (Page 4)

MBP25 Page 4 User's Guide
Introduction
MBP25 is an electronic kit that has been developed for midi bass pedal applications.
Unfortunately our supplier (Fatar) does not offer bass pedals with 25 or more keys
but only versions with 13 or 17 keys. As many customers have been asking for a
basspedal with 25 keys we decided to develop an electronic kit that can be used to
connect two bass pedals with 13 keys each (Fatar PD/3) to obtain a 25 key bass
pedal in a very economic way. Of course MBP25 can be used also in combination
with one PD/3 only. The picture below shows one possibility how two PD/3 pedals
can be combined to a 25 key pedal and built into a black varnished wooden case (the
electronics is not to be seen).
The construction is made of two 13 keys pedals PD/3 and the MBP25 electronic kit.
One of the two pedals has to be shortended by one key as one of the "C" keys is
redundant. Fortunately the PD/3 pedals use a plastic frame and can be shortened
with passable effort. In this user's manual the shortening and wiring of the two bass
pedals is described later. A bit mechanical skills and suitable tools are required
(soldering iron, saw, screwdriver). Both pedals can be mounted on a common base
plate and covered by a suitable case (e.g. made of varnished wood - as shown
above) can be added. The base plate and the case are not included and have to be
added by the customer. We do not offer these parts.
The MBP25 electronic kit is already prepared to connect a third pedal so that even
bass pedals with up to 36 keys are possible (in this case the upper "C" of two pedals
has to be removed). For this version a special cable has to be used that leads to the
second and third pedal.
In addition a rotary or slider potentiometer can be connected to transmit midi volume
data (midi control change #7).
MBP25 is available only as an assembled and tested pc board. The pc board
measures are about 82 mm (length) x 73 (width) x 25 mm (height). Four mounting
holes with 3 mm diameter are available for mounting the pc board to a suitable base
or front panel e.g. with distance sleeves or spacers and screws.
Remark: All basspedals manufactured by Fatar that include velocity are equipped
with solid steel frames and cannot be shortened in such an easy way. In addition the
connectors of PD/3 and PD/2A are not compatible.